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The Cryosphere An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/tc-2020-239
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-2020-239
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  11 Sep 2020

11 Sep 2020

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This preprint is currently under review for the journal TC.

Geodetic point surface mass balances: A new approach to determine point surface mass balances from remote sensing measurements

Christian Vincent1, Diego Cusicanqui1,4, Bruno Jourdain1, Olivier Laarman1, Delphine Six1, Adrien Gilbert1, Andrea Walpersdorf2, Antoine Rabatel1, Luc Piard1, Florent Gimbert1, Olivier Gagliardini1, Vincent Peyaud1, Laurent Arnaud1, Emmanuel Thibert3, Fanny Brun1, and Ugo Nanni1 Christian Vincent et al.
  • 1Université Grenoble Alpes, CNRS, IRD, Grenoble-INP, Institut des Géosciences de 'Environnement (IGE, UMR 5001), 38000 Grenoble, France
  • 2Université Grenoble Alpes, CNRS, ISTerre, Grenoble, France
  • 3Université Grenoble Alpes, INRAE, UR ETGR, Grenoble, France
  • 4Université Savoie Mont-Blanc, CNRS, Laboratoire EDyTEM, 73000 Chambery, France

Abstract. Mass balance observations are very useful to assess climate change in different regions of the world. As opposed to glacier-wide mass balances, which are influenced by the dynamic response of each glacier, point mass-balances provide a direct climatic signal that depends on surface accumulation and ablation only. Unfortunately, major efforts are required to conduct in situ measurements on glaciers. Here, we propose a new approach that determines point surface mass balances from remote sensing observations. We call this balance the geodetic point surface mass balance. From observations and modelling performed on Argentière and Mer de Glace glaciers over the last decade, we show that the vertical ice flow velocity changes are small in areas of low bedrock slope. Therefore, assuming constant vertical velocities in time for such areas and provided that the vertical velocities have been measured for at least one year in the past, our method can be used to reconstruct annual point surface mass balances from surface elevations and horizontal velocities alone. We demonstrate that the annual point surface mass balances can be reconstructed with an accuracy of about 0.3 m w.e. a−1 using the vertical velocities observed over the previous years and data from Unmanned Aerial Vehicle images. Given the recent improvements of satellite sensors, it should be possible to apply this method to high spatial resolution satellite images as well.

Christian Vincent et al.

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Christian Vincent et al.

Christian Vincent et al.

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Short summary
In situ glacier point mass-balances data are crucial to assess climate change in different regions of the world. Unfortunately, these data are rare because huge efforts are required to conduct in situ measurements on glaciers. Here, we propose a new approach from remote sensing observations. The method has been tested on Argentière and Mer de Glace glaciers (France). It should be possible to apply this method to high spatial resolution satellite images as well on numerous glaciers in the world.
In situ glacier point mass-balances data are crucial to assess climate change in different...
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